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We have an older model 62U6 subwoofer and we're getting a slight hum. I'm pretty sure we could repair it if we had a set of schematics. Would they be available and how to get them? Thank

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: M&K series mx200 subwoofer humming

There are a couple of possibilities. The first one is just moving the ac cord that goes to the power supply away from the board by tucking it into the insulation. The other is you may have a bad (oscillating) STK- 4050 output IC which is availabe from MCM electronics. The power supply caps may also need to be replaced.

Posted on Mar 08, 2009

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SOURCE: I have a Velodyne fsx-12 subwoofer. Problem is

Velodyne is the only source for parts and service on this unit.

You will need to contact Velodyne

Posted on Sep 21, 2009

  • 1 Answer

SOURCE: loud hum out of BaseCube 12 subwoofer

Actually I"m having the same problem. It is most probably the capacitors on the power supply internally. they are known to dry out and go back. cheap easy fix by a competent electronics repair facility. Also Cambridge will fix it for $75 plus shipping

Posted on Jun 04, 2010

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I have the Klipsch Sub-10 Subwoofer, and it no longer plays music. Now it hums (vibrates constant) and corresponds (louder or softer) with volume control. Light is home but no one home situation. V


Does the subwoofer have the same hum when the input cables have been unplugged? Many input cables use very fine conductors, which often fail. A bad cable will often introduce a hum and prevent a signal from getting through. If the noise is still present without the input cable(s) connected, then repair options are limited. No schematics are available. There's a daughterboard that has been available, but its failure usually causes the system to die (short-circuit). The cost to repair the amplifier may be close to the cost to replace the entire sub.

Sep 14, 2014 | Klipsch Synergy Sub-10 Subwoofer Speaker

1 Answer

Vizio 42" LCD just quit


Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary. .....

Mar 28, 2017 | Vizio 42 in. LCD TV

1 Answer

Fan is getting power but will not spin..can hear it hummin, motor is dayton model 2LY98


Most of the time if there is power to the motor and all it does is 'hum' then you have a bad motor.
Before replacing it however - I would look at it's capacitor (a small device, usually silver in color, about he size of a pack of cigerettes) and see if it's visibly 'bulged' which is most always an indication that it's bad. If it is - you could solve your problem by changing the capacitor. Also, you could check for electrical connections that have burnt off or have come loose. There is just a slight chance that the capacitor/wiring is your problem - but it's worth checking out. If not, then you will need to get an AC tech to troubleshoot the system, unless you decide to just replace the motor yourself.
Note: If this is a 'central unit' with an 'outside unit' and all it does is 'hum' there is slight chance that what you are hearing is the 24V causing the contactor (in the unit) to hum which is pretty much normal - however - if this the problem and the outside unit is not running (only humming) I would check my fuses and breaker. You could just have a blown fuse or a breaker that needs resetting.
ALWAYS make sure the electrical power is completely OFF before trying to make any checks/repairs.
Hope this helps.

Aug 05, 2011 | Dayton Heating & Cooling

1 Answer

Subwoofer will not produce sound. Connections are correct. I do hear a hum or a crackel as I pull the connection on and off. AVR-689 model


In order to ensure output to your subwoofer: make sure the subwoofer is connected to the subwoofer out of your amplifier and make sure that your amplifier/receiver is set to output multi channel sound

May 07, 2011 | Denon AVR-689 Receiver

2 Answers

Has humming sound when powers on


You may have a power problem. Check to make sure that your wires aren't touching and not crossed.If this doesn't help try plugging in you sub to different plug could be getting interference electrically in the spot it's in

Feb 06, 2011 | Cambridge Soundworks BassCube 15 Speaker

1 Answer

I burned up some resistors in my klh asw120 # r52 r48 and r49 i need the values to them so i can replace them they are too burnt to tell the color code please get back to me with the values! Thanks JASON


This is a pretty common problem with this sub.

Here's a solution that I posted earlier this year, including schematics for the upper and lower circuit boards. Be sure to check the circuit board revisions to make sure they match my schematics.

Aug 10, 2010 | KLH ASW10-120 Subwoofer

2 Answers

Mirage s8 subwoofer is emitting a constant hum


that is just the radio from the input,its normal

Jun 19, 2010 | Mirage Prestige S8 Subwoofer Speaker

1 Answer

Subwoofer hum from STR-DH800


That points pretty much to a bad shield on the cable. Have you tried another one? Another thing to try is to rotate the AC power cord on the sub (if it has one). Sorry, too lazy to look it up.

Dec 29, 2009 | Sony STR-DH800

1 Answer

Hum no audio output


There are a lot of folks who've had power supply issues with this sub. Typically, the large resistors fail, which takes out the capacitors.

If you know how to read schematics and replace parts, then these might be helpful to you:

Here are the two pages of schematics from KLH. I wrote to their tech department and explicitly asked for permission to share them here.

Here's the lower board, which has the power supply:
KLH ASW 10-120 subwoofer schematic - lower board


Here's the upper board:

KLH ASW 10-120 subwoofer schematic - upper board

Dec 22, 2009 | KLH ASW10-120 Subwoofer

2 Answers

Older Harman Kardon computer speakers have loud hum


The hum (50 or 60 Hz) is caused by the AC power getting into the entry point of the amplifier. Either the filtering capacitors from the powersource of the speakers have dried up - replace them - or there is a short in the cables.
There is another possibility: if you have kicked the subwoofer  box its transformer might have slipped from its fixings and now is touching the subwoofer speaker frame.
The only way to find which is to open the cases.

Nov 28, 2009 | Harman Kardon HK695 Computer Speakers

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